autobuild[sn-devel-184]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-184) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-05-09-1557/flakey.log

The failure seems to be in the "samba-ad-dc-6" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-05-09-1557/samba-ad-dc-6.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-184/2019-05-09-1557/samba-ad-dc-6.stdout
  
The top commit at the time of the failure was:

commit 04c0e5212d53e8018f631927bd7d07edd724b77c
Author: David Disseldorp <ddiss at samba.org>
Date:   Thu Apr 18 20:14:31 2019 +0200

    ctdb/build: fix ctdb_mutex_ceph_rados_helper builds
    
    2b5dbb352553699afce62dca4964eb0bd64477f8 fixed builds with an explicit
    --with-libcephfs but broke builds against system Ceph libraries. This
    change handles both cases.
    
    Signed-off-by: David Disseldorp <ddiss at samba.org>
    Reviewed-by: Martin Schwenke <martin at meltin.net>
    
    Autobuild-User(master): Martin Schwenke <martins at samba.org>
    Autobuild-Date(master): Thu May  9 04:24:56 UTC 2019 on sn-devel-184

and the last 50 lines of the stdout log were:

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
badPwdCount = '3'
lockoutTime = '132018910446784200'
badPasswordTime = '132018910446784200'
logonCount = '4'
lastLogon = '132018910413695840'
lastLogonTimestamp = '132018910324954860'
userAccountControl = '512'
msDS-User-Account-Control-Computed = '16'
Failed to get kerberos credentials (kerberos required): kinit for lockout1krb5 at SAMBA.EXAMPLE.COM failed (Clients credentials have been revoked)

Account locked out: kinit for lockout1krb5 at SAMBA.EXAMPLE.COM failed (Clients credentials have been revoked)

gensec_spnego_create_negTokenInit_step: gssapi_krb5: creating NEG_TOKEN_INIT for ldap/localdc failed (next[(null)]): NT_STATUS_ACCOUNT_LOCKED_OUT
Failed to bind - LDAP client internal error: NT_STATUS_ACCOUNT_LOCKED_OUT
Failed to connect to 'ldap://localdc' with backend 'ldap': LDAP client internal error: NT_STATUS_ACCOUNT_LOCKED_OUT
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
badPwdCount = '3'
lockoutTime = '132018910446784200'
badPasswordTime = '132018910446784200'
logonCount = '4'
lastLogon = '132018910413695840'
lastLogonTimestamp = '132018910324954860'
userAccountControl = '512'
msDS-User-Account-Control-Computed = '16'
UNEXPECTED(failure): samba4.ldap.password_lockout.python(ad_dc_slowtests).__main__.PasswordTestsWithSleep.test_login_lockout_krb5(ad_dc_slowtests)
REASON: Exception: Exception: Traceback (most recent call last):
  File "/memdisk/autobuild/fl/b3093467/samba-ad-dc-6/source4/dsdb/tests/python/password_lockout.py", line 1163, in test_login_lockout_krb5
    self._test_login_lockout(self.lockout1krb5_creds)
  File "/memdisk/autobuild/fl/b3093467/samba-ad-dc-6/source4/dsdb/tests/python/password_lockout_base.py", line 549, in _test_login_lockout
    self.fail()
AssertionError: None

FAILED (1 failures, 0 errors and 0 unexpected successes in 0 testsuites)

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba4.ldap.vlv.python(ad_dc_slowtests)(ad_dc_slowtests) -> 634
samba4.ldap.confidential_attr.python(ad_dc_slowtests)(ad_dc_slowtests) -> 351
samba4.rpc.samr.passwords.lockout on ncacn_np with (ad_dc_slowtests) -> 240
samba4.rpc.samr.passwords.pwdlastset on ncacn_np with (ad_dc_slowtests) -> 213
samba4.rpc.samlogon on ncacn_np with (ad_dc_slowtests) -> 58
samba4.rpc.samr.passwords.badpwdcount on ncacn_np with (ad_dc_slowtests) -> 29
samba4.rpc.samr.passwords on ncacn_np with (ad_dc_slowtests) -> 26
samba4.rpc.samr.large-dc on ncacn_np with (ad_dc_slowtests) -> 18
samba4.rpc.samr.users on ncacn_np with (ad_dc_slowtests) -> 10
samba4.rpc.samr.users.privileges on ncacn_np with (ad_dc_slowtests) -> 5
ERROR: test failed with exit code 1
Makefile:16: recipe for target 'test' failed